Sink unit



FIG. 1 is a front elevational view of a sink unit in acordance with my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a right side elevational view, the left side elevational view being a mirror image thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom view thereof. 

The ornamental design for a sink unit, as shown and described. 